Methodology for calculating J-integral range <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mo>Δ</mml:mo><mml:mi>J</mml:mi></mml:math> under cyclic loading

Hagihara, Seiya; Shishido, Nobuyuki; Hayama, Yutaka; Miyazaki, Noriyuki

doi:10.1016/j.ijpvp.2021.104343

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…Various fracture mechanics theories, such as Elastic-Plastic Fracture Mechanics (EPFM) or J-integral, can be used to analyze the behavior of materials with plastic zones near a crack tip. Many engineers and researchers frequently employ the J-integral approach 7,[10][11][12][13] Conventional methods for evaluating the J-integral in HDPE pipes have primarily focused on J-integral formula as a line integration that neglect crack-face loads and body forces. Therefore, our study employs a finite element method to accurately account for these factors in analyzing the impact of axial cracks (internal and external) under varying internal pressures.…”

Section: Introductionmentioning

confidence: 99%

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Using J-integral analysis to predict the failure of HDPE pipes under crack face load and internal pressure

Gaidi,

Ouldyerou,

Aminallah

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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Cracks in pipes used for water transfer have been identified as a significant contributor to water loss and potential failures. To assess fracture behavior, the J-integral was computed for 3D finite element HDPE pipes (DN 355) with axial internal and external cracks (with a/ c and a/ t ratios of 0.5) subjected to a range of internal pressure (16–30 bar) and crack face load condition. Four ratios of a/ c ranging from 0.3 to 0.9 (with an increment of 0.2) were examined with the internal crack. Results indicate that under face crack loading, the external axial crack exhibits a higher J-integral intensity than the internal axial crack. J-integral values greater than 8.4 kJ/m2 were found to lead to pipe failure, with higher internal pressures (25–30 bar for external crack, and 30 bar for internal pressure). Moreover, the a/ c ratio plays a significant role in influencing the distribution of J-integral along internal crack arc length. For pipes of DN 355 size with axial cracks, internal pressure exceeding 20 bar is not recommended. These findings underscore the importance of considering J-integral values in pipe design to prevent failure.

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